AbsolutAire LMCB24-SR User Manual

194

I20618 - Subject to change. © Belimo Aircontrols (USA), Inc.

LMCB24-SR (-T)

Proportional Control, Non-Spring Return, Direct Coupled, 24V, for 2 to 10 VDC and 4 to 20 mA

Torque min. 45 in-lb for control of damper surfaces up to 11 sq ft.

LMCB24-SR LMCB24-SR-T

Application

For proportional modulation of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications.

The actuator is mounted directly to a damper shaft from 1/4” up to 5/8” in diameter by means of its universal clamp. Shafts up to 3/4” diameter can be accommodated by an accessory clamp.

The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500Ω resistor, a 4 to 20 mA control input from an electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for position indication or masterslave applications.

Operation

The actuator is not provided with and does not require any limit switches, but is electronically protected against overload. The anti-rotation strap supplied with the actuator will prevent lateral movement.

The LMB series provides 95° of rotation and a visual indicator indicates position of the actuator. When reaching the damper or actuator end position, the actuator automatically stops. The gears can be manually disengaged with a button on the actuator cover.

The LMCB24-SR… actuators use a sensorless Brushless DC motor, which is controlled by an Application Specific Integrated Circuit (ASIC). The ASIC monitors and controls the actuator’s rotation and provides a digital rotation sensing (DRS) function to prevent damage to the actuator in a stall condition. Power consumption is reduced in holding mode.

Add on auxiliary switches or feedback potentiometers are easily fastened directly onto the actuator body for signaling and switching functions

Dimensions

(All numbers in brackets are in millimeters.)

D120

Technical Data LMCB24-SR

Power Supply 24 VAC ± 20% 50/60 Hz

24 VDC ± 10% Power Consumption 1.5 W (0.4 W) Transformer Sizing 3 VA (Class 2 power source) Electrical Connection 3 ft, 18 GA plenum rated cable

1/2” conduit connector Overload Protection electronic throughout 0 to 95° rotation Operating Range Y 2 to 10 VDC, 4 to 20 mA Input Impedance 100 kΩ (0.1 mA), 500Ω Feedback Output U 2 to 10 VDC (max 0.5 mA) Angle of Rotation max. 95°, adjust. with mechanical stop Torque 45 in-lb [5 Nm] Direction of Rotation

reversible with switch. Actuator will move:

=CCW with decreasing control signal (10➞2V) =CW with decreasing control signal (10➞2V)

Position Indication reflective visual Indicator (snap-on) Manual Override external push button Running Time 35 seconds, constant independent of load Humidity 5 to 95% RH non condensing

(EN 60730-1) Ambient Temperature -22°F to +122°F [-30°C to +50°C] Storage Temperature -40°F to +176°F [-40°C to +80°C] Housing NEMA 2/IP54 Housing Material UL94-5VA Agency Listings cULus acc. to UL 60730-1/-2-14 and

CAN/CSA C22.2 No.24, CE according

to 73 / 23 / EEC Noise Level <45dB(A) Servicing maintenance free Quality Standard ISO 9001 Weight 1.1 lbs [0.5 Kg]

LMCB24-SR-T

Electrical connection Screw terminal (for 26 to 14 GA wire) Housing NEMA 1/IP20

1/4” to 3/4” [6 to 26] 5/16” to 3/4” [8 to 26]

1.85” [47]

4.57” [116]

2.6” [66]

0.86” [22]

3.7” [94]

2.34” [59.4]

2” [50.8]

195

I20618 - Subject to change. © Belimo Aircontrols (USA), Inc.

Wiring

LMCB24-SR… - Typical Specification:

Proportional control damper actuators shall be electronic direct-coupled type, which require no crankarm and linkage and be capable of direct mounting to a shaft from 1/4” to 5/8”. Shafts up to 3/4” diameter can be accommodate with an accessory clamp. Actuators must provide proportional damper control in response to a 2 to 10 VDC or, with the addition of a 500Ω resistor, a 4 to 20 mA control input from an electronic controller or positioner. Actuators shall have Brushless DC motor technology and be protected from overload at all angles of rotation. Actuators shall have reversing switch and manual override on the cover. If required, actuator will be provided with screw terminal strip for electrical connections (LMCB24-SR-T). Run time shall be constant and independent of torque. A 2 to 10 VDC feedback signal shall be provided for position indication. Actuators shall be cULus listed, have a 5-year warranty, and be manufactured under ISO 9001 International Quality Control Standards. Actuators shall be as manufactured by Belimo.

LMCB24-SR (-T)

Proportional Control, Non-Spring Return, Direct Coupled, 24V, for 2 to 10 VDC and 4 to 20 mA

W265

2 to 10 VDC and 4 to 20 mA control of LMCB24-SR

Accessories

K-LM20 3/4” [20 mm] Shaft Clamp AV6-20 Shaft Extension ZG-LMSA Shaft Adaptor for 1/2” Diameter Shafts ZG-LMSA-1 Shaft Adaptor for 3/8” Diameter Shafts ZS-T Terminal Cover for NEMA 2 ZS-100 Weather Shield - Steel ZS-150 Weather Shield - Polycarbonate Tool-06 8 mm & 10 mm Wrench S1A, S2A Auxiliary Switch (es) P370 Shaft Mount Auxiliary Switch P…A Feedback Potentiometers SGA24 Min positioners in NEMA 4 housing SGF24 Min positioners for flush panel mounting PTA-250 Pulse Width Modulation Interface IRM-100 Input Rescaling Module ADS-100 Analog to Digital Switch ZG-R01 Resistor for 4 to 20 mA Conversion NSV24 US Battery Back-Up Module ZG-X40 Transformer Note: When using LMCB24-SR… actuators, only use acces-

sories listed on this page.

24 VA C Transformer

Line Volts

Control Signal

2 to 10 VDC

Feedback Signal

(–)

(+)

(–) (+)

Blk (1) Common

Red (2) Hot +

Wht (3) Y Input, 2 to 10V

Org (5) U Output, 2 to 10V

1 0

–

24 VA C Transformer

Line Volts

4 to 20 mA

Control Signal

Notes:

Provide overload protection and disconnect as required.

Actuators may be connected in parallel. Power

consumption and input impedance must be observed. Actuator may also be powered by 24 VDC.

The ZG-R01 500Ω resistor converts the 4 to 20 mA

control signal to 2 to 10 VDC, up to 2 actuators may be connected in parallel.

Only connect common to neg. (–) leg of control circuits.

Feedback for “X” models only.

(–) (+)

Ω

500Ω

To other

actuators

Blk (1) Common

Red (2) Hot +

Wht (3) Y Input, 2 to 10V

Org (5) U Output, 2 to 10V

1 0

–